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May 01 2016

Voltage Dividers Calculator

Category: DC — dq @ 12:21 PM

Click the button below to determine if you want to use R1 and R2 or R1 and Rtotal.

Click the button below to find which unknown value.

Now enter three of the values and click Calculate to find the fourth):

Ein (Volts In) R1 (OHMs Resistance) ????? Eout (Volts Out)




Voltage Divider Formulas
R1 & R2 R1 & Rtotal
Ei = (Eo/R2)(R1+R2) Ei = (Eo / (Rtotal -R1)) * Rtotal
R1 = (R2 * (Ei – Eo)) / Eo R1 = Rtotal – ( (Eo / Ei) * Rtotal )
R2 = (Eo * R1) / (Ei – Eo) Rtotal = (Ei / ( Ei – Eo )) * R1
Eo = Ei * R2 / (R1+R2) Eo = Ei * (Rtotal – R1) / Rtotal

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